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Interference of human's ankle to the channel characteristics of near surface WUSN

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The Journal of China Universities of Posts and Telecommunications 2014年第1期21卷 36-42页

作者： LI Li WU wei CHEN Jian-ya LIU yun-jie State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

Because of its potential applications in agriculture, environment monitoring and so on, wireless underground sensor network（WUSN） has been researched more and more extensively in recent years. The main and most important difference of WUSN to terrestrial wireless sensor network（WSN） is the channel characteristics, which determines the design methodology of it. In this paper, the propagation character of electromagnetic（EM） wave in the near surface WUSN is analyzed, as well as the path loss model of it is given. In addition, the influence of human＇s ankle to the channel characteristics of near surface WUSN is investigated by electromagnetic theory analysis, simulation and experiment. A novel path loss model of near surface WUSN which takes the interference of human＇s ankle into consideration is proposed. It is verified that the existing of human above the WUSN system may cause additional attenuation to the signal of near surface WUSN which propagates as lateral wave along the ground. Moreover, the relation of the attenuation and operating frequency is deduced, which gives a reference to extend the frequency band applied in WUSN.

关键词： WUSN lateral wave human tissue path loss model EM wave attenuation

Multiphase fluid dynamics and transport processes of low capillary number cavitating flows

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Acta Mechanica Sinica 2009年第2期25卷 161-172页

作者： Xiangbin Li Guoyu Wang Zhiyi yu wei Shyy Department of Thermal Energy Engineering Beijing Institute of Technology 100081 Beijing China Department of Nuclear Science and Engineering North China Electric Power University 102206 Beijing China Department of Aerospace Engineering University of MichiganAnn Arbor MI 48109 USA

To better understand the multiphase fluid dynamics and associated transport processes of cavitating flows at the capillary number of 0.74 and 0.54, and to validate the numerical results, a combined computational and experimental investigation of flows around a hydrofoil is studied based on flow visualizations and time-resolved interface movement. The computational model is based on a modified RNG k-ε model as turbulence closure, along with a vapor-liquid mass transfer model for treating the cavitation process. Overall, favorable agreement between the numerical and experimental results is observed. It is shown that the cavi- tation structure depends on the interaction of the water-vapor mixture and the vapor among the whole cavitation stage, the interface between the vapor and the two-phase mixture exhibits substantial unsteadiness. And, the adverse motion of the interface relates to pressure and velocity fluctuations inside the cavity. In particular, the velocity in the vapor region is lower than that in the two-phase region.

关键词： Low capillary number cavitation Multiphasedynamics Flow visualization Turbulent cavitationmodeling

Collecting and analyzing key-value data under shuffled differential privacy

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Frontiers of Computer Science 2023年第2期17卷 241-243页

作者： Ning WANG wei ZHENG Zhigang WANG Zhiqiang wei yu GU Peng TANG Ge yu Faculty of Information Science and Engineering Ocean University of ChinaQingdao 266100China School of Computer Science and Engineering Northeastern UniversityShenyang 110819China Key Lab of Cryptologic Technology and Information Security Ministry of EducationShandong UniversityQingdao 266200China School of Cyber Science and Technology Shandong UniversityQingdao 266200China

1 Introduction Key-value data,as NoSQL data widely used in recent years,has been frequently collected and used for analysis in major websites and mobile *** frequency distribution estimation on the key domain,as well as the mean estimation of values associated with the same key,are crucial and worth billion dollars in the ***,in real applications,the key-value records are submitted by terminal devices of different *** collecting the information from users may pose serious risks on personal *** the other hand,the emerging shuffled differential privacy(SDP)model[1]is proposed to collect sensitive data from users.

关键词： NoSQL app value

A Transversely Isotropic Magne to -Elec tro-Elastic Circular Kirchhoff Plate Model Incorporating Microstructure Effect

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Acta Mechanica Solida Sinica 2022年第2期35卷 185-197页

作者： wei Shen Gongye Zhang Shuitao Gu yu Cong School of Civil Engineering Chongqing UniversityChongqing 400044China Jiangsu Key Laboratory of Engineering Mechanics School of Civil EngineeringSoutheast UniversityNanjing 210096China LMEE University Paris-SaclayUniv Evry91020EvryFrance

A non-classical model for transversely isotropic magneto-electro-elastic circular Kirchhoff plates is established based on the extended modified couple stress *** Gibbs-type variational principle is used to obtain the governing equations and boundary cond计*** illustrate the newly derived model,the static bending problem of a clamped circular plate subjected to a uniformly distributed constant load is solved numerically by Fourier-Bessel *** numerical results show that the values of transverse displacement,electric and magnetic potentials predicted by the current model are always smaller than those of the classical model,and the differences are diminishing as the plate thickness *** addition,it is shown that the magneto-electro-elastic coupling effect plays an important role in the transverse displace-ment,elec trie pot ential and magnetic pot ential of the magne to-elec tr o-elastic circular Kirchhoff ***,several reduced specific models are provided for simpler cases.

关键词： Circular Kirchhoff plate Magneto-electro-elastic plate Microstructure effect Couple stress theory Static bending

Analysis of the incidence and influencing factors of hyponatremia before ^(131)I treatment of differentiated thyroid carcinoma

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World Journal of Clinical Cases 2021年第36期9卷 11173-11182页

作者： Jing-Jia Cao Can-Hua yun Juan Xiao Yong Liu wei wei wei Zhang Department of Nuclear Medicine The Second HospitalCheeloo College of MedicineShandong UniversityJinan 250033Shandong ProvinceChina

BACKGROUND Hyponatremia is a common clinical electrolyte ***,the association between hyponatremia and acute hypothyroidism is *** hypothyroidism is usually seen in patients who undergo preparation for radioactive iodine *** To analyze the incidence and influencing factors of hyponatremia in a condition of iatrogenic acute hypothyroidism in patients with differentiated thyroid cancer(DTC)before ^(131)I *** The study group consisted of 903 DTC patients who received ^(131)I *** clinical data before and after surgery,as well as on the day of ^(131)I treatment were *** to the blood sodium level before ^(131)I treatment,patients were divided into the non-hyponatremia group and hyponatremia *** between serum sodium levels before ^(131)I treatment and baseline data were *** analysis and binary logistic regression were performed to identify the influencing factors of *** A total of 903 patients with DTC,including 283(31.3%)males and 620(68.7%)females,with an average age of 43.8±12.7 years,were included in this *** serum sodium levels before surgery and ^(131)I treatment were 141.3±2.3 and 140.5±2.1 mmol/L,respectively(P=0.001).However,the serum sodium levels in males and females before ^(131)I treatment were lower than those before *** aged more than 60 years and less than 60 years also showed decreased serum sodium levels before ^(131)I *** addition,the estimated glomerular filtration rate(eGFR)in males and females decreased before ^(131)I treatment compared with those before surgery(P=0.001).Moreover,eGFR in patients over 60 years and under 60 years decreased before ^(131)I treatment,when compared with that before *** were no significant differences in serum potassium,calcium,albumin,hemoglobin,and blood glucose in patients before surgery and ^(131)I treatment(P>0.05).Among the 903 patients,23(2.5%)were diagnosed with h

关键词： Differentiated thyroid cancer Hyponatremia Incidence Low iodine diet Logistic regression analysis

Relative manifold based semi-supervised dimensionality reduction

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Frontiers of Computer Science 2014年第6期8卷 923-932页

作者： Xianfa CAI Guihua WEN Jia wei Zhiwen yu School of Medical Information Engineering Guangdong Pharmaceutical University Guangzhou 510006 China School of Computer Science and Engineering South China University of Technology Guangzhou 510006 China Shenzhen Key Laboratory of High Performance Data Mining Shenzhen 518055 China

A well-designed graph plays a fundamental role in graph-based semi-supervised learning; however, the topological structure of a constructed neighborhood is unstable in most current approaches, since they are very sensitive to the high dimensional, sparse and noisy data. This generally leads to dramatic performance degradation. To deal with this issue, we developed a relative manifold based semisupervised dimensionality reduction （RMSSDR） approach by utilizing the relative manifold to construct a better neighborhood graph with fewer short-circuit edges. Based on the relative cognitive law and manifold distance, a relative transformation is used to construct the relative space and the relative manifold. A relative transformation can improve the ability to distinguish between data points and reduce the impact of noise such that it may be more intuitive, and the relative manifold can more truly reflect the manifold structure since data sets commonly exist in a nonlinear structure. Specifically, RMSSDR makes full use of pairwise constraints that can define the edge weights of the neighborhood graph by minimizing the local reconstruction error and can preserve the global and local geometric structures of the data set. The experimental results on face data sets demonstrate that RMSSDR is better than the current state of the art comparing methods in both performance of classification and robustness.

关键词： cognitive law relative transformation relative manifold local reconstruction semi-supervised learning

Graphite dust deposition in the HTR-10 steam generator

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Particuology 2013年第5期11卷 533-539页

作者： wei Peng Yanan Zhen Xiaoyong Yang Suyuan yu Institute of Nuclear and New Energy Technology of Tsinghua University The Key Laboratory of Advanced Reactor Engineering and SafetyMinistry of Education

Graphite dust has an important effect on the safe operation of a high-temperature gas-cooled reactor （HTR）. The present study analyzes temperature and flow field distributions in the HTR-10 steam genera- tor. The temperature and flow field distributions are then used to study thermophoretic deposition and turbulent deposition. The results show that as the dust diameter increases, the thermophoretic deposition decreases, while the turbulent deposition first decreases and then increases. The thermophoretic deposi- tion is higher at higher reactor powers, with turbulent deposition growing more rapidly at higher reactor power. For small particles, the thermophoretic deposition effect is greater than the turbulent deposition effect, while for large particles, the turbulent deposition effect is dominant.

关键词： Graphite dustHigh-temperature gas-cooled reactorSteam generatorDeposition

Deep-learning-based cryptanalysis of two types of nonlinear optical cryptosystems

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Chinese Physics B 2022年第9期31卷 293-300页

作者： Xiao-Gang Wang Hao-yu wei Department of Applied Physics Zhejiang University of Science and TechnologyHangzhou 310023China Department of Optical Engineering Zhejiang A&F UniversityHangzhou 311300China

The two types of nonlinear optical cryptosystems(NOCs)that are respectively based on amplitude-phase retrieval algorithm(APRA)and phase retrieval algorithm(PRA)have attracted a lot of attention due to their unique mechanism of encryption process and remarkable ability to resist common *** this paper,the securities of the two types of NOCs are evaluated by using a deep-learning(DL)method,where an end-to-end densely connected convolutional network(DenseNet)model for cryptanalysis is *** proposed DL-based method is able to retrieve unknown plaintexts from the given ciphertexts by using the trained DenseNet model without prior knowledge of any public or private *** results of numerical experiments with the DenseNet model clearly demonstrate the validity and good performance of the proposed the DL-based attack on NOCs.

关键词： optical encryption nonlinear optical cryptosystem deep learning phase retrieval algorithm

Synthesis of novel hydrated ferric oxide biochar nanohybrids for efficient arsenic removal from wastewater

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Rare Metals 2022年第5期41卷 1677-1687页

作者： Tong Zhu yun Zhang yu Chen Jun-Liang Liu Xiao-Li Song College of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

Hydrated ferric oxide(HFO)has high adsorption efficiency for As(Ⅲ).However,its high self-aggregation usually reduces the efficiency and limits the scaledup ***,biochar(BC),with large surface area and amounts of surface functional groups was used to tune the loading and distribution of HFO to prepare an efficient adsorbent(HFO/BC)via in-situ synthesis *** influence of the mass ratio of iron salt to BC on HFO/BC morphology was investigated,and the mechanism was *** results showed that novel HFO was formed and distributed uniformly on the surface of BC when the mass ratio of iron salt to BC was 5:*** adsorption kinetics and isotherms studies show that the novel HFO/BC(5:1)composite can fast treat As(Ⅲ)with a high adsorption capacity of 104.55 mg·g^(-1),indicating that it is a potential material for removing arsenic from polluted water.

关键词： Hydrated ferric oxide Arsenic removal Biochar Water treatment